/*
  ==============================================================================

    OpenGLUtils.cpp
    Created: 17 Jan 2026 11:41:12am
    Author:  esca

  ==============================================================================
*/

#include "OpenGLUtils.h"
#include <vector>
#include <math.h>

void svCol(Vertex &v, float newColour[4]){
    v.colour[0] = newColour[0];
    v.colour[1] = newColour[1];
    v.colour[2] = newColour[2];
    v.colour[3] = newColour[3];
}

void setColour(std::vector<Vertex> &verticeList, float newColour[4]){
    for(Vertex v : verticeList){
        svCol(v, newColour);
    }
}

void vTransform(std::vector<Vertex> &verticeList, float x, float y){
    for(Vertex &v : verticeList){
        v.position[0] += x;
        v.position[1] += y;
    }
}

void vScale(std::vector<Vertex> &verticeList, float x, float y){
    for(Vertex &v : verticeList){
        v.position[0] = v.position[0]*x;
        v.position[1] = v.position[1]*y;
    }
}

std::vector<Vertex> generateSineWave(int numVertices, float angle, float startingColour[4]){
    //generates one cycle of a sine wave with vertices numVertices and starting at angle angle

    std::vector<Vertex> ret(numVertices, Vertex{});
    for (int i = 0; i<numVertices; i++){
        ret[i].position[0] = (float)i*1/numVertices;
        ret[i].position[1] = sin(angle+i*(2*M_PI/numVertices));
        svCol(ret[i], startingColour);
    }
    return ret;
}